NewDelhi,the27thAugust,2008G.S.R.612(E).In exercise of the powers conferred by section 61 of the Petroleum and NaturalGas Regulatory Act, 2006 (19 of 2006), the Petroleum and Natural Gas Regulatory Board herebymakesthefollowingregulations,namely:1.Shorttitleandcommencement.(1) These regulations may be called the Petroleum and Natural Gas Regulatory Board(TechnicalStandardsandSpecificationsincludingSafetyStandardsforCityorLocalNaturalGasDistributionNetworks)Regulations,2008.(2)TheyshallcomeintoforceonthedateoftheirpublicationintheOfficialGazette.

(b) "active regulator" means a regulator in pressure regulating station (PRS) thatnormallycontrolstheoutletpressure(c)"authorizedperson"meansacompetentpersonwhoisassignedbytheowneroroperatortocarryoutaspecificjobbasedonhiscompetencylevelaslaiddownbytheBoardunderregulations(d)"cityorlocalnaturalgasdistributionnetwork"(hereinafterreferredtoasCGDnetwork) means an interconnected network of gas pipelines and the associatedequipments used for transporting natural gas from a bulk supply high pressuretransmission main to the medium pressure distribution grid and subsequently tothe service pipes supplying natural gas to domestic, industrial or commercialpremisesandCNGstationssituatedinaspecifiedgeographicalarea(e)"consumermeter"meansameterthatmeasuresgasdeliveredtoaconsumerattheconsumer'spremises(f)"creepreliefvalve"meansareliefvalveinstalledtorelieveoverpressurecausedbycreepinthedownstreamsystemandhavingmaximum1%flowcapacity(g)"citygatestation(CGS)"meansthepointwherecustodytransferofnaturalgasfrom natural gas pipeline to the CGD network takes place and this may also bereferredtoasCityGateMeasuringandPressureRegulatingStation(h) "competent person" means an individual recognized by the CGD networkowner/operator based on his proficiency and skill set achieved by appropriatecombination of education, training and practical experience in the critical traits aslaiddownbytheBoardunderregulations(i)"DistributionPressureRegulatingStationorDistrictRegulatingStation(DPRS)"means a station located within authorized area for CGD network having isolation,pressureregulatingandoverpressureprotectiondevices(j)"electrofusionjoint"meansajointmadeinthermoplasticpipingbypassingthecurrent through the electrical coil provided in the fitting and heating the partssufficiently to permit adequate flow and fusion of the materials between the twosurfacesputincontact(k) "Monitor and Active Regulators" means an arrangement of two regulatingdevices in series whose pressure settings are stepped so as to allow one (Active)normallytocontroltheoutletpressureandtheother(Monitor)toassumecontrolintheeventoffailureoftheactivedevice(l)"operator"meansanentitythatoperatesCGDnetworkwiththeauthorizationoftheBoard(m)"owner"meansanentitythatownstheCGDnetworkandhasbeenauthorizedbytheBoard(n) "primary network" means a part of CGD network that operates at pressureabove100psig(7bar)andbelow711psig(49bar)andpipelinesformingpartofthisnetworkcalledGasMainorDistributionMainorRingMainshallbedesignedtoensureuninterruptedsupplyofgasfromoneormoreCityGateStationstosupplygas to the secondary gas distribution network or service lines to bulk customersthroughservicelines(o)"SlamShutValve"meansavalvethatisdesignedtoclosequicklyintheeventofanabnormalpressure(whetherexcessorlow)beingdetectedataselectedpointinagassystem(p)"secondarynetwork"meansapartofCGDnetworkthatoperatesatapressurebelow100psig(7bar)andabove1.5psig(100mbar)andpipelinesformingpartofthisnetworkshallbecalledlowPressureDistributionMainswhichshallbedesignedto ensure uninterrupted supply to tertiary network or to industrial consumersthroughservicelines(q)"subtransmissionpipeline"meansahighpressurepipelineconnectingthemaintransmissionpipelinetothecitygatestationbutisownedbytheCGDentity(r)"tertiarynetwork"meansapartofCGDnetworkthatoperatesatpressurelessthan 1.5 psig(100 mbar) and pipelines forming part of this network to servicePressureDistributionMainsshallbedesignedtoensureuninterruptedgassupplytoservicelineshttp://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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(2)Wordsandexpressionsusedandnotdefinedintheseregulations,butdefinedintheActor in the rules or regulations made thereunder, shall have the meanings respectivelyassignedtothemintheActorintherulesorregulations,asthecasemaybe3.Application.Definitions, design, materials and equipment, welding, fabrication, installation, testing, operationandmaintenanceandcorrosioncontrolofCGDnetworkshallbeinaccordancewithrequirementsofASMEB31.8exceptinsofarassuchrequirementsarespecificallycancelled,replacedormodifiedbytherequirementsspecifiedintheseregulations.4.Scope.(a) These regulations cover the design, materials, fabrication, installation, inspection andtesting, commissioning, operation, maintenance, modifications and abandonment of CGDnetworkfordomestic,commercialandindustrialusers.(b) Requirements of these regulations shall apply to all pipelines, distribution mains andpiping facilities downstream of inlet isolation valve of city gate station (CGS) up to andincluding consumer meter for commercial or industrial customer and up to final isolationvalveincludingconnectinghosetogasappliancefordomesticconsumer.(c) Design, materials, fabrication, installation, inspection and testing, commissioning,operation,maintenance,modificationsandabandonmentofsteelpipelinebetweencitygatestation and natural gas pipeline (sub transmission pipeline) shall be as per separateregulations.(d)TheCNGStation,CNGMotherStation,CNGOnLineStationandCNGDaughterStationshall be designed, operated and maintained in line with the requirements of the ChiefControllerofExplosivesasdetailedintheGasCylinderRules,2004asmodifiedoramendedfrom time to time. This includes compression, handling and transportation activities ofcompressednaturalgas.(e) These regulations also cover safety aspects of operation and maintenance of CGDnetworkandtherequirementscoveredhereintheseregulationsaremeanttosupplementthesafetyrequirementsalreadycoveredunderASMEB31.8.5.Intent.(a)Itisintendedtoapplytheseregulationstoallnewandsuchaspectsofalreadyexistingnetworks as design, fabrication, installation, testing at the time of construction andcommissioning. However, if an entity has laid, built, constructed or expanded the CGDinfrastructure based on some other standard or is not meeting the standards specified inthese regulations, the entity needs to carry out a detailed technical audit of itsinfrastructurethroughaBoardauthorizedorapprovedthirdpartyagencybytheBoard.Theentitythereaftershallsubmittherecommendationsmadebythethirdpartyalongwithitstimebased mitigation plan and implementation schedule to the Board for authorizationwithinsixmonthsfromthedateofnotificationoftheseregulations.(b)ThecontinuationofoperationofexistingCGDnetworkshallbeallowedonlyifitmeetsthefollowingrequirements,namely:(i)TheCGDsystemdownstreamofcitygatestationshallhavebeentestedinitiallyat the time of commissioning in accordance with ASME B 31.8 Chapter IV (withminimumtestpressureof1.4timesofMAOPforsteelnetworkand1.4timeMAOPor 50 PSI whichever is higher for PE network). The entity should have properrecords of the same. Such test record shall have been valid for the currentoperation.Alternatively,ifsucharecordisnotavailable,theentityshouldproduceinservicetestrecordoftheCGDnetworkhavingtestedatapressureof1.1timeofMAOPasperASMEB31.8(ii)TheCGDsystemhasleakdetectionsysteminpositionandisoperative.ForpipelinenetworkitshallbeodorisationbasedandforenclosuressuchasCGS,abovegroundDPRS,itshallbegasleakdetectionbased.(iii)TheCGDsystemhasinpositionnecessarypressurereliefvalvesand(iv) There shall be protection of the system against third party damages both inrespecttosteelpipe,PEpipeandcoppertubing.Providedthat(a) The entity shall submit selfcertification in support of meeting theaboverequirementswithinamonthofnotificationoftheseregulationsandinadditionthecertificationbytheapprovedorauthorisedthirdpartyshallbemadeavailabletotheBoardwithinsixmonthsofnotificationhttp://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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(b)Certificationsreferredtoinpara(a)shallbedonebothforoperationandmaintenanceandinfrastructureoftheentityandshallbesubmittedtotheBoardwithmitigationplanandimplementationschedule(c) The critical components of the system as identified by the Board forsuch existing networks shall be complied with these regulations within aperiodspecifiedatAppendixIandtheauthorizedentityshallmaintaintheintegrityoftheexistingsystematalltimesand(d) Provisions of these regulations related to operation and maintenanceproceduresshallalsobeapplicabletoallsuchexistinginstallations.6.Thestandard.Technical standards and specifications including safety standards (hereinafter referred to asstandards) for city or local natural gas distribution networks are as specified in ScheduleI whichcover material and equipment (Schedule1A), welding (Schedule1B), piping system componentsandfabrication(Schedule1C), design, installation and testing (Schedule1D), operating and maintenance procedures(Schedule1E),corrosioncontrol(Schedule1F)andmiscellaneous(Schedule1G).7.Defaultandconsequences.(1) There shall be a system for ensuring compliance to the provision of these regulationsthroughconductoftechnicalandsafetyauditsduringtheconstruction,commissioningandoperationphase,aswellasonanongoingbasisasmaybespecifiedfromtimetotime.(2) The Board shall monitor the compliance to Technical Standards and Specificationsincluding Safety Standards either directly or by accredited third party through separateregulationsonthirdpartyconformityassessment.(3) In case of any deviation or shortfall, in achieving the targets for implementing thespecifiedstandards,theentitiesshallbeliabletofacethefollowingconsequences,namely:(i)incaseofcriticalactivitiesatAppendixI,theentityshallbegivenasinglenoticeby the Board specifying the time limit to remove the specified shortcoming andensurecomplianceandiftheentityfailstocomplywithinthespecifiedtimelimit,immediatesuspensionortermination,asdeemedappropriate,ofauthorizationshallbedone(ii) in other cases, the Board may issue a notice to defaulting entity allowing it areasonabletimetoremovethespecifiedshortcomingandensurecomplianceandin case the entity fails to comply within the specified time or in case the entitydefaults on more than three occasions, its authorization to lay, built, operate orexpand the CGD network shall be liable for suspension or termination apart fromtakinglegalactionundertheprovisionoftheActandregulationsthereunder.8.Requirementsunderotherstatutes.Itshallbenecessarytocomplywithallstatutoryrules,regulationsandActsinforceasapplicableand requisite approvals shall be obtained from the relevant competent authorities for the CGDnetwork.9.Miscellaneous.(1)Thesestandardsareintendedtoensureuniformapplicationofdesignprinciplesandtoguideselectionandapplicationofmaterialsandcomponents.Thoughthestandardprimarilyfocusesonsafetyofemployees,publicandfacilitiesassociatedwithcityorlocalnaturalgasdistribution networks, it does not eliminate the need for a competent designer and goodengineeringjudgment.3["(2) If any question arises as to the interpretation of these regulations, the

Schedule1AMATERIALSANDEQUIPMENTAll materials and equipment forming a permanent part of the any piping systemconstructed according to this standard shall be qualified for conditions in which it is to beused.MATERIALSFORUSEINCOLDCLIMATESMaterialstobeusedinfacilitiesexposedtolowgroundorlowatmospherictemperaturesorlow operating temperatures shall have adequate impact properties to prevent brittlefractureatlowtemperatures.MATERIALSPECIFICATIONSIn addition to standards and specifications covered in ASME B 31.8, standards andspecifications listed in AnnexureI shall also be acceptable for manufacturing of variouspipingcomponentsformingpartoftheCGDnetwork.SteelPipeCarbonsteelusedinCGDnetworksshallmeetfollowingrequirements:CarbonEquivalentForpipeshavingCarbonContent>0.12%CE(IIW)=C+Mn+Cr+Mo+V+Ni+Cu6515CE(iiw)valueshallbe=0.43%.ForpipeshavingCarbonContent=0.12%CE(Pcm)=C+Si+Mn+Cu+Ni+Cr+Mo+V+5B30202060201510CE(Pcm)valueshallbe=0.25%.NotchToughnessForcarbonsteelpipesofsizeNPS2andabove,notchtoughnessshallbespecified.Electric welded pipes used shall also meet additional requirements specified underAnnexureIIIofthisstandard.DuctileIronPipeUseofductileironpipeisnotpermittedforCGDnetworksfortransportofnaturalgas.PlasticPipeandComponentsThermoplasticpipes,tubesandfittingsarerecommendedforuseincitygasdistributionnetworks.Polyethylene(PE)pipesconformingtoIS14885orISO4437,andPEfittingsconformingtoISO8085Part3shallbeacceptable.Reprocessedmaterialshallnotbeused.ColourofpipesusedforgasserviceshallbeyellowforPE80gradeandOrangeforPE100grade.PEpipesshallbepermanentlymarked(eitherimpressedorembossedtoadepth/heightof0.02to0.15mm).PipesandtubingforabovegroundservicelinesuptometersetassemblyGalvanized Iron (GI) pipes shall be used in above ground service lines up to consumer meter orGalvanizedmetercontrolvalve.Theuseofcoppertubingshallonlybeafterconsumermetersuchthatthisisnotaccessibletothirdparty.GIpipesandcoppertubingshallconformtotherequirementsgiveninAnnexureIV of this standard. Use of nongalvanised pipes should be restricted as far as possiblehowever,incasetheyareusedtheyshallbeproperlyprotectedandpainted.PEpipeshallnotbeusedforabovegroundgaspipes.Tubing / Hose pipe for connecting consumer meter set assembly and consumerappliancehttp://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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Theconnectionbetweenconsumermetersetassemblyandgasappliance(providedbyconsumer)may be made by GI pipes or copper tubing meeting requirements given in AnnexureIV of thisstandard or steel reinforced rubber hose. Steel reinforced rubber hose shall conform to IS: 9573TypeIV.EQUIPMENTSPECIFICATIONSEquipmentusedinCGDnetworkmanufacturedtostandardslistedinAnnexureIIofthisstandardshallalsobeacceptable.CONDITIONSFORREUSEOFPIPEReuseofDuctileIronPipesReuseofductileironpipesisnotpermitted.ReuseofPlasticPipingReuseofplasticpipesispermittedsubjecttothefollowing.a.Itsoriginalandmanufacturingspecificationsareknownanddocumented.b.Itmeetstherequirementsofnewpipesconformingtoitsmanufacturingspecifications.c.Thepipeisfreefromvisibledefects.d. It is installed and tested in accordance with requirements of this standard. All testingshall be carried out at recognized independent laboratory and records of the same aremaintainedSchedule1BWELDINGGENERALTheserequirementsapplytosteelpipeandcomponentsonly.Notchesorlaminationsonpipeendsarenotpermittedandmustberemovedbycuttingthepipeasacylinderandrebevelingofpipeendpriortowelding.QUALIFICATIONOFPROCEDURESANDWELDERSWelding procedures and welders for welding of gas pipelines shall be qualified as per API1104andshallincludetoughnesstestingrequirementsasapplicableforthelinepipe.Weldingproceduresandwelders,forstationpipingshallbequalifiedasperASMEBoilerandPressureVessel(BPV)CodeSectionIXorAPI1104.WhenweldersqualifiedunderAPI1104areemployedforstationpiping,theirqualificationshallbebasedondestructivemechanicaltestingasperAPI1104.INSPECTIONOFWELDSAllNonDestructiveTesting(NDT)includingradiographicexaminationshallbeperformedinaccordancewiththerequirementsofAPI1104exceptthatnorootcrackshallbepermitted.Regardlessofoperatinghoopstressaswellaslocationclassallcarbonsteelbuttweldsshallbe100%radiographed.Incaseradiographyisnotpossibleduetosafetyreasons,weldshallbeexaminedbyusingultrasonictechniques.REPAIRORREMOVALOFDEFECTIVEWELDSWelds having defects shall be removed or repaired in accordance with API 1104 or ASMEBPV code Section IX as applicable. Welders employed for repairs shall be qualified inaccordancewith"QualificationofProceduresandWelders".Weld repair areas shall be subjected to additional radiography or ultrasonic testing afterrepair.Schedule1CPIPINGSYSTEMCOMPONENTSANDFABRICATIONDETAILSPIPINGSYSTEMCOMPONENTSGeneralIn addition to standards and specifications covered under ASME B 31.8 for various pipingcomponents, piping components manufactured conforming to standards and specifications listedunderAnnexureIofthisstandardshallalsobeacceptable.ValvesandPressureReducingDevicesValvesbody,bonnet,coverand/orendflangescomponentsmadeofcastironand/ductileiron(asperASTMA395)shallnotbeusedinCGDnetworks.http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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ValvesusedinservicelinesofsizeNPS2andbelowshallconformtoBSEN331.FlangesFlangesmadeofcastiron,ductileironandnonferrousmaterials(brassorbronze)shallnotbeusedinCGDnetworks.Useofflangesinnaturalgastransmissionanddistributionpipingisnotpermittedexceptforstationpipinge.g.CGS,DRS,MRSetc.Forpipingclass150orabovealltheflangesshallbewithraisedface.BoltingAllstudboltsandnutsusedinCGDnetworksshallbehotdippedgalvanizedasperASTMAgalvanized153orequivalent.FittingsotherthanValvesandFlangesFittingsmadeofcastironandductileironshallnotbeusedinCGDnetworks.AllplasticfittingsusedinCGDnetworksmusthavebeentypetestedbyaninternationallyrecognizedtestingagencypriortotheiruse.Thermoplastic / thermosetting fittings shall not be used in above ground piping system.ThermoplasticfittingsconformingtoISO8085Part3shallbeacceptableandshallmeetfollowingrequirements:(a.) Polyethylene resin used for manufacture of thermoplastic fittings shall bevirgin,cadmiumfreepigmentedcompound.AntioxidantandUVstabilizersusedinPE resin shall not exceed 0.3 and 0.5 percent respectively. Reprocessed materialshallnotbeused.(b.)GradeofPEcompoundusedforthefittingsshouldnotbelessthanthatofPEpipes.Incasefittingsareofdifferentgradethanthatofpipes,compatibilityofthesamewithpipesshallbeestablishedpriortotheiruse.However,incaseofhighergrade fittings separate compatibility test shall not be required. Heating elementshallnotbeexposedandallcoilsareembeddedintothebodyofthefittings.(c.)Colouroffittingsshallbeyelloworblack.(d.)ElectrofusionfittingscomplyingwithISO8085Part3/EN15553shallbeusedforallsizesofPEpipes.Fittingsfabricatedfrompipeshallnotbeused.Onlyinjectionmouldedfittingsarerecommended.(e.) 2["For fusion fitting upto 63 mm, the entity may consider usage offusion fitting with integral fixation device. However, external alignmentclampshallbeusedforallsizes."](f.) Each Electro Fusion fitting shall be bar coded. Fusion fittings shall havepermanentfusionindicatororadatacardconformingtoISO7810/ISO7811.(g.) The fusion jointing shall be carried out as per the procedure outlined in thestandardDVS2202orequivalent.(h.) Carbon steel part of transition fittings used for connecting PE system withCarbonSteelsystemmayhavebuttweld/plain/flangedends.SpecialFittingsMechanical fittings for making hot taps on pipelines and mains shall not be used. Fittings for hottapsshallbeweldedtype(forsteelpipelinesandmains)andelectrofusiontype(forthermoplasticmainsandservicelines).EXPANSIONANDFLEXIBILITYFlexibilityRequirementsWhenmaximumgastemperatureexpectedduringoperationisbelow65C,thermalexpansionandstressesintheabovegroundsteelpipingshallbeevaluatedconsideringpipetemperatureof65C.Schedule1DDESIGN,INSTALLATIONANDTESTINGDESIGNINSTALLATIONANDTESTINGGeneralProvisionsThe selection of design for city gas distribution network shall be based on the gas properties,requiredflowrates,operatingpressuresandtheenvironment.CGDnetworkDescriptionAtypicalCGDNetworkshouldcompriseofoneormoreorallofthefollowing:http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

Mains or Distribution Mains normally constructed using steel pipes and connects one ormore Transmission Pipeline to respective CGS or one or more CGS to one or more DPRS.Themaximumvelocityinthepipelinenetworkshouldbelimitedto100 ft / sec (30 m/sec) immediately after pressure regulating instrument. As far aspractical,primarynetworkshouldbefedthroughmorethanonecitygatestations/sourcesofsupply.TheoperatingpressureshallbeasdefinedunderGeneralTerms.ii) Secondary Network: A low Pressure Distribution System comprising of Gas Mains orDistribution Mains usually constructed using thermoplastic piping (MDPE) and connectsDPRStovariousserviceregulatorsatcommercial,industrial,anddomesticconsumers.Thenetworkshallbesizedformaximumflowvelocityof100ft/sec(30m/sec).iii) Tertiary Network: A service Pressure Distribution System comprising of Service Lines,Service Regulators and customer/ consumer Meter Set Assemblies constructed using acombinationofthermoplastic(MDPE)pipingandGI/coppertubingcomponents.[Note: For italicized terms used in description of above networks, definitions asperASMEB31.8shallapply]iv)Citygatestation(CGS):typicallycomprisingof,butnotlimitedto,thefollowingfacilities:FiltersSeparators(ifrequired).Meteringfacilities.Heater(ifrequired) Pressure reduction skid comprising active and monitor combination with aminimum 50% redundancy with stream discrimination arrangement, includingslam shut valve for over and under pressure protection and creep relief valves(streamredundancyshallnotbelessthan2+1). Online odorization equipment designed to minimize fugitive emissions duringloading,operationandmaintenance.v)DistributionPressureRegulatingStationorDistrictRegulatingStation(DPRS):Locatedatvariousdemandcentersfordomestic/commercialuserstypicallyconsistsof:GasfilterHeater(ifrequired)Pressurereductionskidcomprisingactiveandmonitorcombinationwithminimum50% redundancy with stream discrimination arrangement, including slam shutvalve for over and under pressure protection with additional feature of underpressureprotectionifrequired(streamredundancyshallnotbelessthan2+1).Inletandoutletisolationvalves.vi)IndividualPressureRegulatingStation(IPRS):LocatedatthepremisesofanindividualcustomerandhavingfacilitiessimilartoDPRShowever,monitorregulatormayormaynotbeprovided.Meteringfacilitiesmayormaynotbepartofthisstation.vii) Service Regulators: Usually located at customer premises for maintaining supplypressure and designed to maintain safe condition even in the event of rupture in theregulatordownstreamsection.NetworkDesignRequirementsThedesignofCGDNetworksanditscomponentsshallbesuchthatitensures: Supply of gas at constant volume into a system, which fluctuates in pressure betweenpredeterminedupperandlowerlimitsinthedistributionnetwork,orSupplyofgasataconstantpressureatconsumerend,andThedesignshouldrecognizetheneedforsafeguardagainstmalfunctionofanyequipmentand provide sufficient redundancy to ensure that the supply is secured against suchmalfunctions.FacilitiesformingpartofCGDnetworksshallbedesignedconsidering:RangeofflowratesandpressuresrequiredinvarioussectionsofthenetworkQualityofgas,includingcleanlinessinrespectofbothsolidandliquidparticles.Meteringrequirements.NoisecontrolandCorrosionProtectionNecessarycalculationsshallbecarriedouttoverifystructuralintegrityandstabilityofthepipelineforthecombinedeffectofpressure,temperature,bending,soil/pipeinteraction,externalloadsandother environmental parameters as applicable, during all phases of work from installation tohttp://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

Notes:1.Alldistancesareinmeters.Alldistancesshallbemeasuredbetweenthenearestpointsontheperimeterofeachfacility.2. For all the distance from the compound wall, the distance mentioned in this table andthelocalbyelaws,whicheverishigheristobeconsidered.#AsperStateElectricityBoardrecommendations.Properlylaidoutroadsaroundvariousfacilitiesshallbeprovidedwithintheinstallationareaforsmoothvehicularaccess.Facilityshallbeprovidedwithproperboundarywall/fencingwithgate(s)inlinewithMHA(MinistryofHomeAffairs)guidelines.Buried piping inside the CGS area shall have a minimum depth of cover of 1.2 m. Whereburiedpipescomeoutoftheground,theundergroundcoatingonthepipewillcontinueforalengthofatleast300mmaboveground.http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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Platforms and crossovers shall be provided for ease of operation and maintenance ofequipmentandpipingwhererequired.Provision should be made for venting, purging and draining all sections of pipe work andequipmentthatmayhavetobeisolatedduringconstructionormaintenance.Allventsshallberoutedtoasafeareaandinamannerthatgasventedoutisblownawayfromthenearestbuilding.Heightofventshallbeminimumthree(3)metersaboveworkinglevel.Distancebetweenventandboundarywall/fenceshallbeminimumfive(5)meters.Gasdetectorsshallbeinstalledatstrategiclocationscoveringtodetectanygasleakage.In case fired gas heaters are installed for heating of gas, all other facilities handling gasshouldbelocateddownwindfromheaters.(b)DistributionPressureRegulatingStation(DPRS)andIndividualPressureRegulatingStation(IPRS)DPRSfacilitiescanbelocatedabovegroundorbelowground.IncaseDPRSislocatedbelowground,thefacilitiesshalleitherbeinsideaenclosedchamberwith a provisions for entry of authorized personnel or be a buried hermetically sealedmoduletypewithpropercathodicprotection.For below ground installations, the vent line shall be terminated at a minimum height ofthree(3)metersabovethegroundlevel.IPRSshallnormallybelocatedaboveground.DPRS/IPRS installed above ground shall be provided with proper security fencing as perrequirement of local authorities. The distance between fencing and the wall of nearestbuilding/structureshallnotbelessthantwo(2)meters.NOTES:i. The consumer, shall be responsible for ensuring the separation distances for customerownedIPRSii. Customer shall ensure that IPRS installation has been independently approved bycertifiedthirdpartyagencybeforetheentitysuppliesthegas.iii.Theconsumershallensurerecertificationoncein3years.EM>RequirementsforElectricalInstallationsinCGDNetworkAllelectricalequipment/installationsshallmeetfollowingrequirements: Electrical area classification of Installation, as basis for selection of Electrical Equipment,shallfollowIS5572. The specification of Electrical equipments shall be in line with IS 5571, "Guide forselectionofElectricalEquipmentforHazardousArea".FireprotectioninElectricalinstallationsshallbeprovidedasperrequirementsspecifiedinthisstandard.Allelectricalequipment,systems,structuresandfencing,etc.shallbesuitablyearthedinaccordance with IS 3043. The earthing system shall have an earthing network grid withrequirednumberofelectrodes.AllElectricalequipmentoperatingabove250voltsshallhavetwo separate and distinct connections to earth grids. Separate earthing grid shall beprovidedforinstrumentandelectricalpower. Lightening protection shall be provided as per the requirements of IS:2309. Selfconducting structures having metal thickness of more than 4.8mm may not requirelightningprotectionwithaerialrodanddownconductors.Theyshall,however,beconnectedtotheearthingsystem,atleast,attwopointsatthebase.InstrumentandControlSystemInstrumentationandcontrolsystemfortheCGDnetworks,shallingeneralmeettherequirementofAPI Standards: API RP551, 552, 553, 554, 555 and 556 "Manual on Installation of RefineryInstrumentsandControlSystems"totheextentapplicable.Buildings Intended for Human Occupancy and Location Classes for Design andConstructionFor the purpose of determining number of buildings for human occupancy and LocationClasses,1miledistanceshallbereplacedby1600mandfractionsthereof.In case of cluster of buildings, Location Class 2 or Location Class 3 may be terminated adistanceof200mfromthenearestbuildinginthecluster.http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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LocationClass2or3shallbeterminatedatleast200mfromtheenddwellingi.e.dwellinglocatedattheboundaryoftheLocationClass2or3asthecasemaybe.WhenpresenceofmultistorybuildingsaloneresultinLocationClass4,theLocationClass4ends200mfromthenearestbuildingwith4ormorestoriesaboveground.ThisstandarddoesnotallowDesignofpipelinesandpipingasperLocationClass1,LocationClass2andLocationclass3.LocationClass1,2and3shallbeusedonlyforrecertificationofexistingInstallationsandfacilities, which were laid/built/constructed before the date of notification of theseregulationsSTEELPIPEAdditionalRequirementforNominalWallThicknessConsiderationshallalsobegiventoloadingduetofollowingwhileselectingnominalwallthicknesstasperASMEB31.8asappropriate:OverburdenloadsDynamicandseismicloadsCyclicandvibratoryloadsInternalpressurefluctuationsGeotechnicalloads(includingslides,differentialsettlementofpiping,lossofsupport,andthermaleffectofthepipelineonsoilproperties).2["In any case minimum thickness of pipe permitted as per this standard shall be 6.4

mm for pipe size 4 inch nominal die, and above, irrespective of the grade of the pipematerial.Inallexistingcaseswherethicknessofpipeislessthan6.4mmforpipesize4inchandabove. Quantitative Risk Assessment shall be carried out and the risk level shall bereducedtoALARP(Aslowasreasonablypossible).For both aboveground and underground pipe size less than 4 inch nominal dia., theminimumnominalthicknessshallbeaspertablebelow:MinimumPipeWallThickness(RefASMEB36.10M)ANSIRating150#to300#NPS

Identification

ScheduleNo.

0.5

XS

80

0.75

XS

80

XS

80

1.5

XS

80

XS

80

STD

40

"]DesignFactorsFandLocationClassesDesign factor corresponding to Location Class 4 shall only be used. All exceptions to basic designfactorstobeusedindesignformulashallbeasperTable2ofthisstandard.http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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PipelinesorMainsonBridgesPipeline on bridges should be avoided. Under unavoidable conditions, pipeline installed on railroad,vehicular, pedestrian, or other pipeline bridges, a design factor of 0.40 shall be used for LocationClass4.IncitieswherecrossingtheriverthroughHDDcrossingisnotpossible,pipelinelayingonriverbridgesispermitted.MeteringFacilitiesUpstreamdrygasfilter(s)shallbeinstalledwhenrotaryorturbinemetersareused.Pressure/FlowControlFacilities(a)Protection against over pressure of pipeline or mains downstream of city gate station(CGS)shallbeprovidedasfollows:(1) The provision of Active / Monitor Regulator System (i.e. monitor regulator inseries with a controlling (active) regulator) shall be the principal method ofcontrollingpressure.[Note : To avoid problems associated with a regulator being at rest forprolonged periods it is recommended that the monitor regulator is soimpulsedthatitcanalsooperateasafirststageregulator.](2) Adequately sized pressure relief valve(s) could be used for overpressureprotection downstream of controlling regulator(s) provided Quantitative RiskAssessment is made for environmental hazards (fire / explosions) associated withlargereleaseofgasvolumeofgasreleaseandtherisksarefoundwithinacceptablelevel.Pressurereliefvalve(s)shouldbecarefullysizedtomeettheirrequireddutyandtominimize the volume of gas released. The speed of relief valve opening should beadequateandtheyshouldreseatcleanlywhennormalpressuresarerestored.Therelief valve should be installed and provided with test connections in the impulsepipeworkinsuchawayastoenablethemtobesetupandtestedinsitu.(3) Over pressure shutoff valve(s) or SlamShut Valve(s) upstream of thecontrolling regulators are preferred as overpressure protective devices instead ofpressure relief valves. Being ultimate overpressure protection for the pipelinesystem,itisessentialthattheSlamShutvalvesarefastclosing,highlyreliableandsecurevalve.(b)Theisolationvalveofthesensinglinesofregulatorsandslamshutvalvesshouldhaveprovisionforlockinginopenposition.(c) Additionally suitable gas heaters upstream of regulators / control valves/ pressurereduction system should be provided in case after pressure let down operating conditionswouldresultinlowtemperaturesbeyonddesignconditionsofdownstreamfacilities.(d) Sound pressure levels shall be limited to the values prescribed by EnvironmentalAuthoritiesbutinnocaseitshallexceed110dbA.Table2DesignFactorsforSteelPipeConstructionFacility

Notes:1Higherthicknessmaybeusedifrequiredtocontrolstressesorstabilityduringinstallationandoperation.2ThickerpipeinLocationClass1isrequiredthroughouttheassemblyandforadistanceequaltolesserof5diametersor10ftineachdirectionbeyondthelastfitting.3 Near concentration in Location Class 1 and 2 means places of public assembly (school,temple,church,hospital,club,marketsplacesetc.)usedby20ormorepeoplefrequently.*LocationClass1,2&3shallbeusedforthepurposeofrecertificationofExistingInstallationsonly.(e)Gas velocities in piping up to 20 m/sec before filter and 40 m/sec (120 ft / sec) afterfilter, at peak flow conditions, may be permitted provided care is taken to ensure thatallowable sound pressure values are not exceeded and materials selected are suitable topreventerosionatsuchhighvelocities.However, the gas velocity shall not cross the recommended velocity given by the OriginalEquipmentManufacturerfortheequipmentsusedinthePRI.(f) Gas filtration facilities with 100% redundancy shall be provided to avoid damage toinstrumentationandotherfacilities.(g) Immediately downstream of regulators or control valves, use of conical reducers isrecommended.(h) In order to prevent over pressurization of piping downstream of regulators / controlvalves,creepreliefvalveshouldbeprovided,ifrequired.(i)For isolation of the CGS during emergency, quick closing valve (with remote operationfacilityincaseofunmannedstation)shallbeinstalledattheinletofCGS.Protectionofpipelinesandmainsfromhazardshttp://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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When steel pipelines or mains are installed in areas that are normally under water, antibuoyancy measures adopted shall be such that specific gravity of resulting installation is1.10ormore.Pipelines and mains installed on bridges and other locations where they are exposed toaccidental damages due to vehicular traffic, suitable barricades / crash guards shall beinstalledfortheirprotection.The pipeline in close proximity to unstable structures, landfill sites or where constructioncouldleadtodamagetopipeline,shouldbeavoided.Pipelinesandmainsinstalledintheareasnormallyunderwaterorsubjecttoflooding(i.e.lakes,bays,orswampsetc.)shallbeprovidedwithadditionantibuoyancymeasuressuchasconcreteweightcoating,geotextilebagsfilledwithgradedstonesoranchorages,etc.topreventfloatation.Minimumspecificgravityofinstallationshallbe1.2afterprovidingantibuoyancymeasures.Cover,ClearanceandCasingRequirementsforBuriedSteelPipelinesandMainsMinimumdepthofcoverforburiedsteelpipelinesshallbeasperthetablegivenbelowTable3:MinimumCoverRequirementsforSteelPipelinesLocation

NOTES:1. Cover shall be measured from the top of coated pipe to the top of the undisturbedsurfaceofsoilorthetopofgradedworkingstrip,whicheverislower.Thefillmaterialintheworkingstripshallnotbeconsideredinthedepthofcover2.Forriver/watercoursesthatarepronetoscourand/orerosion,thespecifiedcovershallbe measured from the expected lowest bed profile after scouring / erosion. Where scourlevelcannotbeestablished,anadditionalcoverofminimum1metershallbeprovidedfromtheexistingbedoftheriver/watercourse.3Thecovershallbemeasuredfromthetopofroadortopofrail,asthecasemaybe.Whenever the above provisions of cover cannot be provided due to site constraints,additionalprotectioninformofcasing/concretingetc.shallbeprovided.http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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ClearancebetweenPipelinesorMainsandotherundergroundstructures(a)When a buried steel pipeline or main has to cross any existing underground pipeline,cable, drain or other services, the pipeline shall be laid at least 300 mm below from suchservices.(b)Whenlaidparalleltoanyexistingundergroundcable,drainorotherutilities,thepipelineormainshallbelaidwithacleardistanceofatleast300mmfromexistingutility.(c) As far as practical, a minimum separation of three (3) meter should be maintainedbetweenthesteelpipelineormainandfootingoftransmissiontower.(d) A clearance sufficiently large to avoid electrical fault current interference shall bemaintainedbetweenthepipelineandthegroundingfacilitiesofelectricaltransmissionlines.(e)Clear distance between new steel pipeline or main running parallel to existing pipelineshould be minimum 5.0 meters when heavy conventional construction equipment isexpected to be utilized. This distance may be reduced, after careful assessment ofconstruction methodologies, to three (3) meters, provided it does not result in unsafeconditions during construction. Existing pipeline should be clearly marked on the groundduring construction. Bilanguage (local language and Hindi / English) caution signs shouldbeinstalledwhileworkinginsuchareas.(f)While laying more than one new hydrocarbon pipelines or mains in the same trench,clearseparationofminimum500mmshallbemaintainedbetweenadjacentpipelines.(g) No steel pipeline or main should be located within three (3) meters of any habitabledwellingoranyindustrialbuildingunlessitisprovidedwithatleast300mmofcoveroverandaboveminimumcoverspecifiedunderTable3aboveorspecialprotectivemeasuressuchasconcreteslab,steelcasingareprovided.CasingRequirementsunderRailroads,Highways,RoadsorStreetsSteel casing at road/railway crossings, when provided to meet statutory requirements, shall bedesignedinaccordancewithAPI1102.Casingpipediametershallbeminimumtwopipesizesbiggerthancarrierpipe.IncaseofPE,thecasingcanbeRCCpipeofminNP3class.Bends,ElbowsandMitersinSteelPipelinesandMainsMiters bends and wrinkle bends are not permitted in pipelines and mains used in CGDnetworksregardlessofoperatinghoopstress.Cold field bend radius for pipes of size NPS 20 and larger shall be minimum 40 times thepipediameter.Asfaraspossibleuseofshortradiuselbowsshouldbeavoided.HotTapsSplitteesdesignedtofullyencirclethepipeshallbeusedformakinghottaps.ThesplitTeesshallbedesignedconsideringaminimumdesignfactorF=0.40.However,incaseofHottapsofsizeupto1/4thofthenominalboreofthemainpipeline,useofweldoletsispermittedinplaceofsplittees.Fullboreballvalveshallbeusedwhenmakingbranchconnectionsusinghottaps.Recommendations as per API RP 2201 Recommended Practice for Safe Hot TappingPracticesinthePetroleumandPetrochemicalsIndustryshallbefollowedwhilecarryingouthottappingworks.Whereitisnotpossibletomaintaintheclearances,cover,ventlocationsetc.mentionedinthis standard, the entity shall carryout special design and construction methodologiesthroughexperiencedpersonnel/consultantandseekclearancefromtheBoard.TestingafterConstructionGeneralProvisionsPropercommunicationfacilitiesshallalsobearrangedforduringtesting.Testingequipments/instrumentsshallbeproperlyinspectedandshallhavevalidcalibrationcertificatesbeforetheyareusedfortesting.TestRequiredtoProveStrengthofPipelinesandMainstooperateatHoopStressesof30%http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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ormoreofSpecifiedMinimumYieldStrengthofPipeAllburiedsteelpipelinesandmainsshallbepressuretestedafterinstallationusingwaterasa test medium. Minimum test pressure shall be equal to 1.4 times Maximum AllowableOperatingPressure.Test procedure as per ASME B 31.8 Appendix N "Recommended Practice for HydrostaticTestingofPipelinesinPlace"shallbefollowed.Holduptimeforthepressuretestingshallbeminimum24hoursforundergroundandfourhourabovegroundpipeline.SafetyDuringTestsRelevantWarningSignsshallbedisplayedatthetestareaThetestareashallbeproperlycordonedtopreventanyaccidents.A proper Emergency Response Plan shall be in place and emergency contact numbers ofrelevantagenciesshouldbevisible.CommissioningofFacilitiesAppropriateWorkPermitshouldbeissuedbasedonthekindofactivity.Firefightingequipmentsshouldbeavailableduringcommissioning.Propercommunicationfacilitiesshouldalsobearrangedfor.AproperEmergencyResponsePlanshouldbeinplaceandemergencycontactnumbersofrelevantagenciesshouldbeavailable.OTHERMATERIALSDuctileIronPipingSystemRequirementsUseofductileironpipingisnotpermittedforCGDnetworksasperthisstandard.DesignofPlasticPipingPlasticpipeshallnotbeusedforPipelineandDistributionMainsoperatingatpressureinexcessof100psig.Useofthermosettingplasticpipingisnotpermittedasperthisstandard.PlasticPipeandTubingDesignFormulaNominalwallthicknessofplasticpipeshallbecalculatedasperfollowingformula:P=2S*(t/(Dt))*0.32WhereD=SpecifiedoutsidediameterinmmP=Designpressureinpsigt=NominalwallthicknessinmmS = Long term hydrostatic strength in barg (psig) determined in accordance with applicable pipespecificationattemperatureequalto73F,100For120F.ThermoplasticDesignLimitationsThedesignpressureshallnotexceed100psig(7bar).Thermoplastic pipe, tubing and fittings shall not be used where operating temperature of thematerialswillbe:1)Below32F(0degreecentigrade)or2) Above 120F (50 degree centigrade) or temperature at which long term hydrostaticstrengthusedindesignformulainpara842.31ofASMEB31.8isdetermined,(whicheverislower).Minimumthicknessshallnotbelessthan2.3mm.PipewallthicknessselectedshallbesuchthatitcorrespondstoStandardDimensionRatioindicatedinTable4below.PipeswithnonstandardSDRshouldnotbeused.

Wheninsistedbytheauthoritiesatidentifiedlocations,alayerofbrick/concreteorimpactresistanttape may be laid over pipeline as a protection against excavating machinery as indicated in theFigure2(a)or(b).PlasticPipeandTubingJointsandConnectionsGeneralProvisionsThreadedjointsinplasticpipearenotpermitted.Plastic piping joints shall be made by Electro Fusion fittings only. Fusion fittings shall have inbuiltpositioningprovisionupto60mmandbeyondexternalclampsystem.Jointing of plastic piping by butt fusion method, solvent cement method, adhesive method, heatfusionmethodorbymeansofcompressioncouplingsorflangesisnotpermitted.Recommendationsofthefittingmanufacturershallbefollowedinthisregard.All electro fusion fittings shall be bar coded and the control unit shall be equipped with bar codereadertodirectlytransferfusiondatatocontrolunit.Barcodingshallbelonglastingevenwhenthejointisburiedincorrosivesoil,alternativelyeachfittingshallhaveadatacardwhichcanbereadbythecomputerandthereafterthecardispositionedwiththejoint.InstallationofPlasticPipingInstallationProvisionhttp://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

SafetyDuringTestingRelevantWarningSignsshallbedisplayedalongthetestsection.Thetestareashouldbeproperlycordonedtopreventanyaccidents.A proper Emergency Response Plan shall be in place and emergency contact numbers ofrelevantagenciesshouldbeavailable.CONTROLANDLIMITINGOFGASPRESSUREControl and Limiting of Gas Pressure in High Pressure Steel, Ductile iron, Cast Iron orPlasticDistributionsystemUseofautomaticshutoffdevice(slamshutvalves)asameansofaccidentaloverpressureofhighpressuredistributionsystemispreferredoverpressurereliefvalvesorweightloadedreliefvalvesorspringloadeddiaphragmtypereliefvalve.DPRS/IPRS shall normally be equipped with minimum two safety devices. At least one ofthem shall be a slam shut valve operating on over pressure for those installations whoseinletoperatingpressureismorethan60psig.Topreventoverpressurizationofdownstreamsystemduringperiodsoflowflow,creepreliefvalvecanbeused.Ifamonitorregulatorisinstalledinthesystem,itshallbesuchthatitisthefirstactingdeviceinthepressuresafetysystem.ControlandLimitingofGasPressureinlowPressureDistributionSystemsA combined Over Pressure ShutOff (OPSO) regulator with builtin creep relief is alsoacceptable device for control and limiting of gas pressure in low pressure distributionsystem.Controlandlimitingofpressureofgasdeliveredtodomestic,smallcommercial,andsmallindustrialconsumersfromhighpressuredistributionsystem.ServiceregulatorwithabuiltinUnderPressureShutOff(UPSO)regulatorisalsoacceptabledeviceforcontrolandlimitingofgaspressuretoconsumer.VALVESAs far as practical, the valves in the distribution mains should be installed below ground with thevalve operating device readily accessible. A stem extension may be used to elevate the valveoperatorabovegroundprovideditdoesnotcauseobstructiontotrafficand/orpedestrians.Insuchcases,sealant/lubricationpointsandventpipeworkshallalsobeextendedabovegroundforeaseof peration. Valves of size 4 inches and above shall be fitted with double block and bleedfacility.Spacingbetweenvalvesondistributionmains,whetherforoperatingoremergencypurposeshallbedecidedasFollows:(a) High Pressure Distribution System: Based on operation and maintenance flexibilityrequirements,valvesmaybeprovidedon:Eithersideofwaterbodycrossings. Strategic takeoff points including future developments.Based on risk associatedwith emergency situations requiring speedy isolation and resulting number andtypeofcustomersaffectedbysuchemergenciesetc.Insteeldistributionmainsvalvespacingshouldnormallynotbemorethan3km, In plastic distribution mains valve spacing should normally not be more than 1km.The above spacing, however, may be increased or decreased based on riskassessmentandtoallowlocationofvalveataneasilyaccessiblelocation.(b) Low Pressure Distribution System: Valves in low pressure distribution system may beprovided at locations requiring isolation for ease of maintenance in addition to thoserequiredasperfollowingPara.DistributionSystemValvesAvalveshallbeinstalledontheinletandoutletpipingofeachregulatorstationcontrollingfloworpressure of gas in distribution system. The distance between the valve and regulator(s) shall beadequate to allow operation of the valve during emergency (such as large leakage or fire). Thesevalvesshouldbelocatedinamannerthattheyareeasilyaccessibleduringemergency.http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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VAULTSAccessibilityIncasepartofVaultorPitextendsaboveground(e.g.toavoidwaterfloodinginlowlyingareasthatcannotbeavoided),then,itshallbelocatedsuchthatitcausesminimuminterference/hindrancetothetraffic/pedestrians.CUSTOMERS'METERSANDREGULATORSLocationforCustomers'MeterandRegulatorInstallationsCustomer meter shall preferably be located on the wall outside the kitchen, however, whencustomers' meters and regulators are located inside the building, it should be located in a wellventilatedarea.GASSERVICELINESGeneralProvisionsApplicabletoSteel,CopperandPlasticServiceLinesServicelinesshallbesizedforamaximumflowvelocityof15m/sec.InstallationofServiceLinesAll plastic pipe and fittings shall be laid underground and shall not be exposed.The buried servicelines shall be provided with a minimum cover of 1.0 m. Where it is impractical to provide 1.0 mcover due to physical constraints, additional protective measures such as concrete slabs or highimpactresistanceplasticsheetsshallbeinstalledatleast300mmabovetheserviceline.Innocasethedepthofcovershallbelessthan600mm.FortransitionfromplasticpipetoGIpipe,transitionfittingsshallbeused.Plasticpartoftransitionfittingprotrudingabovegroundshallbeprotectedbyencasing it with concrete guard.In case carbon steel section beyond transition fitting is belowground, it shall be protected against corrosion by minimum 400 micron thick 2 pack high buildepoxy coating.Above ground service piping shall be GalvanizedGalvanized Iron or copper or carbon steelprotectedbyanticorrosivecoating.Wherevertheservicelineriserisinstalledinconfinedspaceslikebasements,onlyweldedrisersshallbeused.Thegapbetweenriserandwallshallbeminimum25mmtoandshallbesupportedatevery2m.Ventilatorsshallbeprovidedinconfinedspace.TypeofValvesSuitableforServiceLineValvesSoftseatedvalvesinservicelinesarenotpermitted.SteelServiceLinesDesignofSteelServiceLinesAllundergroundsteelservicelinesshallbejoinedbyweldingusingqualifiedweldingprocedureandwelders.InstallationofServiceLinesintoorUnderBuildingUseofsleeveforlayingsteelpipethroughwall,orunderouterwallfoundationsofbuildingorunderthe building is not recommended. Such underground lines shall be protected against corrosion byminimum400micronthick2packhighbuildepoxycoating.DuctileIronServiceLinesUseofductileironservicelinesisnotpermitted.PlasticServiceLinesDesignofPlasticServiceLinesOnlyelectrofusionfittingsshallbeusedinplasticservicepipingincludingpipetopipejoints.InstallationofPlasticServiceLinesInstallation of plastic pipe above ground is not recommended. In case any section of plastic pipeextendsaboveground,itshallbecompletelyencasedinaconcretecasing.Useofflexibleconduitisnotpermitted.InstallationofPlasticServiceLinesintoorUnderBuildingsInstallationofplasticservicelinesunderorinsidethebuildingisnotpermittedasperthisstandard.ServiceLineConnectionstoMainsServiceLinesConnectionstoSteelMainsServicelineconnectiontosteelmainsshallbeasfollows: In case of plastic service line, connection to underground steel main shall be by use oftransition fitting in plastic piping with steel part of transition fitting welded to steel mainpiping.http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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Directconnectionofgalvanizedironorcopperservicelinestoundergroundsteelmainsisgalvanizednotpermitted.ServiceLinesConnectionstoPlasticMainsIncaseofplasticserviceline,connectiontoplasticmainshallbebyuseofelectrofusionfittingsonly.Directconnectionofgalvanizedironorcopperservicelinestoundergroundplasticmainsisgalvanizednotpermitted.PIPINGBEYONDCONSUMERMETERSETASSEMBLYTOGASAPPLIANCEPipingconnectingconsumermetersetassemblytoconsumergasapplianceshallbeeitherGI or copper up to last valve located near actual appliance.A metal seated leak detectioncum excess flow shut off valve shall be provided near the appliance located at easilyaccessiblelocationbytheauthorisedentity.Thevalveshallbedesignedtoshutoffincaseofsuddenleakageofgasfromthehoseorincaseofburnerflameoffcondition.ApplianceshallbeconnectedtogaslinewithaflexibleandbraidedhoseasperIS9573.Thehoseshallnotbeexposedtointernalorexternaltemperatureexceedingtherecommendedlimits. Care shall be exercised not to exceed permissible bend radius specified in IS: 9573(Table1Dimensionsandbendradiiforrubberhoses).Lengthofthishoseshallbekeptminimum.However,innocasethelengthshallbemorethan1.5meters.Bothendsofthehoseshallbefirmlyclampedonthenozzlebymetallicclamps.Schedule1EOPERATINGANDMAINTENANCEPROCEDURESThe present standard covers the City Gas Distribution, Design, Installations, Commissioning andOperation in general. The Operation and Maintenance Procedures prescribed herein under are forgeneralguidelinestobeimplementedaspertheprovisionsofthestandard.Theentitiesengagedinlaying, building, operating and expending City or Local Gas Distribution Network will create anorganizationhandlingoperatingandmaintenanceincludingmeetingtheemergenciesarisinginthesystem.The main operation area would be to handle gas receipt, odorisation and pressure reduction(includingheatingthegas,ifrequired)andmanagingthedistrictregulatingstation,fieldregulatorsandgasmeteringforallkindofcustomerssuchasdomestic,commercialandindustrial.Thegasmeasuringbillingincludingenergybalanceshallbepartoftheoperation.Thesafety,healthandenvironmentincludingcomplianceofregulatorymeasuresshallbeapartoftheresponsibilityoftheoperatinggroup.ThemaintenanceactivityshallcoverthemaintenanceandupkeepoftheCityGateStation(s),DistrictRegulatingStations,FieldPressureregulatingStationsandendconsumersfacilities, sectionalising valves and other assets and facilities. This interalia will evolve regularmaintenance,routepatrollingtocontainthirdpartydamagesandmaintenanceofsafetyprovisionsincludingoffsiteemergencyplanandonsiteemergencyplan,mutualaidanddisastermanagementplan.Thefollowingsectionsbrieflyrefertosuchactivities:1.OperatingandMaintenanceProceduresaffectingthesafetyofgastransmissionanddistributionfacilities.2.ExternalCorrosionControl3.OdorisationOPERATING AND MAINTENANCE PROCEDURES AFFECTING THE SAFETY OF GASTRANSMISSIONANDDISTRIBUTIONFACILITIESBasicRequirementsThe entity operating a CGD network shall have an effective Health, Safety and EnvironmentManagementSystem(HSEManagementSystem)andManagementofChangeSysteminplacetoensureoverallsafetyduringoperationandemergencies.TheHSEManagementSystemshallcoverthefollowingkeyelements..HSEPolicyStatement.Organizationalobjectivestoensureimplementationofthepolicy.SetofdetailedprocessessupportingeachactivitiesoftheHSEmanagementsystem.Implementationofcontrolandmonitoringactivities.Periodicmonitoring,reviewandreportingofperformance.Auditofinternalandexternalactivitieshttp://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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FollowingprocessesshallbepreparedaspartofHSEManagementSystem:.EmergencyManagementSystemtosafelyhandleemergencieswithminimalrisk..DisasterManagementPlanencompassingoffsiteandonsiteemergencyresponseplansandmutualaidsystem.HazardIdentificationProcessessuchasHAZOP.RiskAnalysisandRiskAssessmentProcesssuchasQRA. Safety and Technical Competency System. . An Operational Health and Safety Legalapplicability Matrix as well as Operational Health and Safety (OH&S) Legal Compliancematrix.. An Environmental Legislative Register (ELR) to provide the user a register of practicalimplementationintermsofdaytodayactivitieswithwhichtheoperationhastocomply.Ofparticularrelevancearethedetailsofconsents/permits/authorizationorlicensesrequiredforanactivityandfromwhomandhowitisobtained..AdditionalpracticeslikecarryingoutperiodicWorkPlaceInspectionofallCriticalActivitiesby senior management team, implementation of Behavior Based Safety Programs andimplementationofSafetyInterventionSystemshouldbeconsideredtoimprovethesafetycultureoftheorganization.For Safe Control of Operations (SCO), a systematic Management of Change process shall bedeveloped to identify and consider the impact of changes to pipeline systems and their integrity.ManagementofChangeshouldaddresstechnical,physical,proceduralandorganizationalchangesofthesystem,whetherpermanentortemporaryGISbasedassetmanagementsystem:TheentityoperatingaCGDnetworkshallputinplaceaGIS (Geographical Information System) based system with the intention of capturing the entireunderground gas network and customer database. This system shall include details of the entirepipenetwork.AllthepipelineslaidshallbeidentifiedinGISthroughgeoreferencedcoordinates.AllfailuresinthepipelinesshallbemappedinGISforinvestigations.Thesystemshallincludethefollowingfeatures:A)Entirenetworkviewabilityononeplatformtomanagethehugedatabase.B) All network extensions and expansions to be mapped andupdated in GIS with georeferencedcoordinatesforbetteridentification.C) Immediate availability of the new constructed pipeline locations and customer baseinformationtotheusergroupsallowingrelatedanalysis,planningandfutureprojectionsofnew possibilities of pipelines, customers, gas volumes and revenue including jobs to beundertakenbythirdparty.GISshallbeusedduringtheentirelifecycleoftheasset.EssentialFeaturesoftheOperatingandMaintenanceplanOperatingandMaintenanceprocedureshouldalsoaddressthefollowing. Preventive maintenance plan and procedures required in accordance withrecommendationsofOriginalEquipmentManufacturer(s)(OEMs)..Awelldesignedsystemofperiodicinspectionforallfacilities..Calibrationplanformeters,gaugesandotherinstrumentsaffectingqualityandsafetyofsystem..Planforfunctionaltestingofpressureregulationandcontrolequipment(Active/MonitorRegulator,SlamShutValve,PressureReliefValves,controlvalvesetc.)..Isolationscheme(completewithdrawingsshowingtheorientationofthefacilities,locationofmajorservices,powerswitches,entryandemergencyexits,fireassemblypointsetc.).Itshouldcovermaincomponents,includingtheiridentificationnumber..Limitsofoperatingparameters(pressure,temperature,flow,levelsetc.).AnAlarmManagementSystemtomonitor,analyze,segregateandappropriateaction.. "Work Permit" procedures to be followed by maintenance personnel for protection ofpropertyfromdamageandfireetc..Procedurestologoperationandmaintenanceactivities..PersonalProtectiveEquipments(PPE)tobeusedbyalloperatingpersonnel..Do'sandDon'tsandsafetyprecautionsduringoperationandmaintenance.Provisionsofperiodicinspectionsalongtherouteofsteelpipelinesormainsshallincludeallsectionsofpipelinesandmainsirrespectiveofoperatinghoopstress.EssentialFeaturesoftheEmergencyPlanEntities operating CGD Networks shall provide for an Emergency Control Room, mannedroundtheclockandequippedwitheffectivecommunicationsystemandemergencyvehiclesfitted with communication facilities, first aid equipment, fire extinguishers, gas detectors,repairkitsandtools,maps,plans,materialsafetydatasheetsetc.atitsdisposal.The CGD entity shall put in place an Emergency Response Plan, a Disaster ManagementPlanandaPandemicPlan.Whilepreparingtheseplanstheentityshalltakeintoconfidencehttp://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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thevariouslocalauthorities(i.e.TheFireauthorities,Policeauthorities,Healthauthorities,localadministration,DisasterManagementauthorities,Mutualaid,Factoryinspectorateetc)andclearlyelaborateontheirroleincaseofanincident.Accident/emergencyreportingproceduresThe entity shall put in place a documented in house accident reporting procedure and itsresponse plan for all kind of accidents/emergencies such as (i) near miss accidents, (ii)accidents without loss of production, supply or human life, (iii) accidents with loss ofproduction, supply or human life, (iv) fire (v) explosion or other emergencies leading todisaster effecting outside public. The level of reporting shall also be mentioned in theprocedure. The Board shall be informed in respect of the accidents/emergencies undercategory(iii),(iv)and(v)abovewithremedialmeasuresfor avoiding recurrence in the format placed at EnclosureI of Schedule 1E. The entitiesshallinvestigateandreporteachoftheaboveincident/accidenttodifferentlevelasspecifiedintheaboveenclosure.Notwithstandinganythingcontainedhereinunder,incaseanyincidentescalatesandgetsmedia attention or gets published in newspapers, the entity shall proactively inform theBoard of the same immediately with preliminary investigation report. Further, detailedreportofthefindingsshallbefurnishedtotheBoardwithinaperiodofthirtydays.WrittenEmergencyproceduresSpecialattentionshouldalsobegiventofollowingwhilepreparingEmergencyprocedures:."Do'sandDon'ts"duringandemergencyandothersafetyinstructions..Telephonenumbersofemergencyresponseteammembers,emergencyservices,mutualaid industries, district authorities, law enforcing agencies, contractors / vendors, fireservices,districtcivicauthorities,etc..Actionstobetakenduringanemergencyincludingwarning/cordoningoffofaffectedareaand informing the civil authorities and / or other utility companies affected by anyemergency.Training. Training shall be imparted to the CGD Network operating and maintenance staff at thetimeofinductionfollowedbyperiodicrefreshercourses.Thetrainingprogramshouldcoverfollowing:.HazardouscharacteristicsofGas..Familiarizationwithcommissioning,operationandmaintenanceprocedures..Handsonexperienceonoperationofemergencyandmanualshutdownsystems..Effectiveisolationofanygasleak..Safetyregulationsandaccidentprevention..Firefightingequipmentoperationanditsupkeep..FirstAidandHousekeepingThe training process should be subjected to periodic internal audits to ensure effectiveimplementationandimprovement.Trainingshallincludemocksafetydrills,atleasttwiceayear.Trainingprogramshallalsoenvisionimpartingtrainingtoemployeesandcontractorsofotherutilitycompanies sharing the same corridor to make them aware about hazards associated with leak /damages.LiaisonEntity owning or operating CGD networks should have designated personnel to liaison with otherexisting utility companies, district local administration and gas supplying companies. A utility coordination team consisting of representatives from all other utility companies and civil authoritiescansubstantiallyimprovesafetyrecords.EducationalPrograms:Entities operating CGD Networks shall undertake a comprehensive public awareness program forconsumersandgeneralpublic.Theeducationalmaterialshallbepreparedinlocal,HindiandEnglishlanguage.Localaudiovisualmediaavailableshouldbeusedforsucheducationalprogrammes.PipelineFailureInvestigationBesidesreportingandrecordingofallinstancesofassetrelatedfailures,damagetotheenvironmentandthirdpartypropertyshallalsoberecorded.http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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Failureinvestigatingteamshallcomprisepersonneltrainedinfailureinvestigations.The data from all failure occurrences should be analyzed for trends so that proper initiativesincludingtrainingcouldbetakentominimizefailures.PreventionofAccidentalIgnitionSite Specific Risk Assessment should be carried out before commencing any repair activities. Theoutcomeofsuchriskassessmentshouldbedocumentedandconsideredwhilepreparingsafetyplanfortherepairwork.Nohotworkshouldbeundertakenwithoutproperworkpermitissuedbyauthorizedpersonnel.BlastingEffectsNoblastingshouldbecarriedoutwithincitylimitsandnearanythirdpartystructuresorfacilities.Inanycaseblastingshallonlybeusedafterproperauthorizationfromcivilauthoritiesevenifitissafetocarryoutsuchoperations.DISTRIBUTIONPIPINGMAINTENANCE.MarkersMarkers shall be positioned along entire network at a maximum spacing of 100 meters in urbanareaand200meterswithinindustrialparksforsteelmains.Additionalwarningsignsormarkersshallbeinstalledtoindicatethepresenceofapipelineatroad,highway, railroad, stream, canal, nala crossings and other locations where there is a possibility ofdamageorinterference.A marker shall be marked in bold and legible local language and Hindi / English with at least thefollowing:.NameofCGDNetworkOperatingCompany.ContactTelephoneNumbertoreportemergency..LocationAreaCode.Warning"HighPressureGasLine,DialbeforeDigging"etc.Markersmaynotbeinstalledforservicepipelinewithinconsumerpremises,however,theOperatingCompany shall maintain such service pipeline routing drawings for easy reference. The operatingcompanyshallprovideminimumsafetyinformationtotheconsumer/customerbeforestartingthegassupply.Itshallbemandatoryforthegrouphousingsocieties/clusterofhousesetc.whichareprovidingtheinbuiltfacilitiesforthenaturalgasconnectivitytoeachandeverydwellingunitinsuchbuildingstohavethelinediagramsoftheconnectionpipingfixedatthemainentranceofsuchpremises.PatrollingPatrollingscheduleshallbesuchthatentireprimarynetworkisinspectedatleastonceinthree(3)monthandsecondarynetworkisinspectedatleastonceeverymonthtoobservesurfaceconditions,construction activity, encroachments, soil wash outs and any other factors that may affect thesafetyandoperationofthenetwork.LeakageSurveysOperatingcompanymusthaveaneffectivemethodtoidentifyandlocateleakagesinthesystem.AnyoneorcombinationofmethodsdescribedinASMEB31.8,AppendixMcanbeadoptedbasedontheireffectivenessforthespecificareas.Highlycongestedareasshallbesurveyedusinggasdetectorsatleastonceinthreemonths.Otherlesscongestedareasshallbesurveyedatleastonceayear.LeakageSurveysusinggasdetectorsshallbedoneinaccordancewiththerequirementsofASMEB31.8.Gasdetectors,dulycalibrated,shallbeavailableatalltimesinreadyuseconditionsforemergencysurveysanduse.RequirementsforAbandoning,Disconnecting,andReinstallingDistributionFacilitiesAbandoning,disconnecting,orreinstallingdistributionfacilitiesshallbeasperASMEB31.8.Anyactivityassociatedwithabandoning,disconnecting,orreinstallingofdistributionfacilitiesshallrequireWorkPermitissuedbytheauthorizedperson.http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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PlasticPipeMaintenanceThe following safety precautions shall be ensured during emergency repairs or breakdownmaintenanceofpipelines:. All naked flames, sources of ignition and mobile phones shall not be allowed in theimmediateworkarea..Gaslevelshouldbemonitoredduringtherepairworkwithgasdetectors.Therepairshallnotbecarriedoutinatmospherewhichcontainsnaturalgas..Adequatefireextinguishingequipmentshallbeavailableduringsuchrepair.SqueezingoffandreopeningofThermoplasticPipeorTubingforPressureControlLocationwhereSqueezingandreopeningisdoneonceshallbemarkedappropriatelytoidentifythatthepipehasbeensqueezedandreopened.Squeezing of reopened pipe at the same location is not permitted. Minimum distance betweenconsecutivesqueezeofflocationsshallnotbelessthanfive(5)meters.RepairofPlasticPipeorTubingDamagedordefectiveplasticpipeshallbecutandreplacedwithnewpipe.Repairofdamagedplasticpipebyusingrepairpatchesisnotpermitted.OnlyrepairmethodallowedisuseoffullencirclementsplitsleeveswhichshallbeinaccordancewithASMEB31.8.MISCELLANEOUSFACILITIESMAINTENANCEFlexiblesteelbraidedhoseusedtoconnectconsumerappliancesshouldbeinspectedatleastonceevery year for leakage, kinking, corrosion, abrasion or any other signs of wear and damage. Anyhosewornoutordamagedmustberemovedfromserviceandreplaced.PIPELINESERVICECONVERSIONSSteel pipelines and mains used in CGD Network shall not be used for duel service. Conversion ofexistingsteelpipelines,previouslyusedforserviceotherthannaturalgas,foruseinCGDNetworksisnotpermitted.RECORDSBesidesthedetailsofleakrecordsascoveredunderASMEB31.8Para851.6and852.6,theCGDNetworkCompanyshallalsomaintainfollowingrecords/documents:.Designspecification.Alignmentsheetsforprimarynetworkofsteelpipelineandassociatedpipebookandotherinstallationandtestrecords.Surveillanceinspectionandmaintenancerecords. Material certification including dimension, metallurgy, destructive and nondestructivetestingrecords,performanceandfunctionaltestreports.WeldingrecordsincludingPQR,WPSandwelderqualificationrecords.Commissioningreports.Nonconformance/deviationrecords.CalibrationrecordsofInspection,Measuring,MeteringandTestequipment.Auditcompliancereports.Statutoryclearances.Approveddrawings/documents.HAZOP/RiskAssessmentreportsandcompliancetorecommendationsofsuchreports.AlloperationandmaintenancemanualsEnclosure1ofSchedule1EReportingFormatTypeI

TypeII

TypeIII

NearMiss WithoutLoss WithLossof

incidentofProduction,Production,SupplyorSupplyorHumanLifeHumanlife

http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

TypeIVFire

TypeVExplosion/Fire/GasLeakage/otheremergenciesinvolvingpublic

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Location

Time

FirstWitnessedby

DetailsofIncident

ActionTaken

Operator(O&M)

Operator(O&M)

ReportingAuthorityInternalInvestigatingAuthority

Head(HSE)

Head(HSE)

ShiftI/C

HSEOfficer SectionI/C

Head(O&M)

Head(HSE)

ExternalInvestigation

ReporttoPNGRB

v(*)

v(*)

HeadofStation

v(*)

vTobefilledin/reportedXNotrequiredtobereported(*)ShallalsoincludethehistoryofTypeI&TypeIIincidentsSchedule1FCORROSIONCONTROLEXTERNALCORROSIONCONTROLNewInstallation/BuriedSteelFacilitiesCoatingRequirements,Coatingsshallfulfillfollowingrequirements:. Coating shall provide good electrical isolation between external surface of the pipe andenvironment..Coatingshallhavesufficientresistancetomoisturetransmission..Coatingshallhavesufficientductilitytoresistcracking.Coatingshallhavegoodmechanicalstrengthorotherwisebeprotectedtoresistdamagedue to normal handling (including concrete coating application where applicable) and soilstress..CoatingshallbecompatiblewithCathodicProtectionsystemandfieldjointcoatings.ForcarbonsteelpipelinesormainsofsizeNPS2andabove,3LayerPolyethyleneorFusionBondedEpoxycoatingisrecommended.AllburiedbendsandfittingsshallbecoatedwithHeatShrinkSleevesortwopackhighbuildliquidepoxycoatingwithminimumDFT450microns.CathodicProtectionRequirementElectricalIsolationWhereinsulatingdevicesareinstalledtoprovideelectricalisolationofpipelinesystemstofacilitatethe application of corrosion control, they shall be properly rated for temperature, pressure, andelectricalpropertiesandshallberesistanttothegascarriedinthepipelinesystems.Thesedevicesshall not be installed in enclosed areas where combustible atmospheres are likely to be presentunlessprecautionsaretakentopreventarcing.Pipesshallbeinstalledsothatthebelowgradeorsubmergedportionsarenotinelectricalcontactwithanycasing,foreignpipingsystemsorothermetallicstructures.Thisshallnotprecludetheuseofelectricalbondswherenecessary.ElectricalConnectionandMonitoringPointshttp://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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Whereahighercurrentcarryingcapacityisrequired,amultistrandconductorshallbeusedandthestrandsshallbearrangedintogroupsnolargerthanNo.6AWG.Eachgroupshallbeattachedtopipewith a separate charge. Attaching test leads directly to the pipe by other methods of brazing isprohibited.When thermit welding process is used for electrical lead installation on pressurized pipelines ormains,precautionsshallbetakentoavoidpossiblefailureofthepipelineormainsduringinstallationdue to loss of material strength at the elevated welding temperatures. Where a thermit weldingprocessisnotdeemedsuitable,considerationshallbegiventoothermethodsofinstallation.ElectricalInterferenceElectricalinterferenceduetofollowingshallalsobeconsideredincathodicprotectiondesign:FaultCurrentsFaultcurrentinterferenceshallbetakenintoconsideration.Faultcurrentresultingfromlightingorupsetconditionsofelectricalfacilitiescould result in serious damage to coating and pipe wall and danger to personnel. These adverseeffects may occur where a pipeline or main is close to the grounding facilities of electricaltransmissionlinestructures,substations,generatingstationsorotherfacilitiesthathavehighshortcircuitcurrentcarryinggroundingnetworks.Whereaburiedpipelineormainisclosetogroundingfacilities,remedialmeasuresmaybenecessarytocontroltheeffectofthesefaultcurrentsinordertoreducetheresultantriseinpotentialgradientintheearthnearthepipelineormaintoanacceptablelevel.InducedPotentialInterferencePipelinesormainsparallelingalternatingcurrentelectricaltransmissionlinesaresubjecttoinducedpotentials. When studies or tests show that alternating current potentials will be or are beinginduced on a buried pipeline or main, devices shall be installed to reduce these potentials to atolerablelevel.When such pipelines or mains are under construction, or when personnel are in contact with thepipelines or mains, special precautions shall be taken to nullify the possible effects of inducedalternatingcurrentpotentials.Install bonding across points where the pipeline or main is to be separated and maintain thisconnectionwhilethepipelineormainisseparated.Make a study in collaboration with the electric company on the common problems of personnelsafety,corrosion,electricalinterferenceandlightingproblems.ExistingInstallationsCathodicallyProtectedPipelineSystemsTemporarilyoutofServiceCathodicProtectionsystemsshallbemaintainedonanypipelineormaintemporarilyoutofservice.TemporaryCathodicProtectionSystemWhenconsiderednecessary,atemporaryCathodicProtectionsystemwithsacrificialanodesshallbeinstalledtoensureadequateprotectionofpipelineormainsfromexternalcorrosionfromthetimethe pipeline or main is laid in the trench till the permanent Cathodic Protection system iscommissioned.Thetemporarycathodicprotectionsystemshallpreferablybeinstalledsimultaneouslykeepingpacewiththepipelineormainlaying/installationworkandshallbemonitoredperiodically.RECORDSCGD Network Company shall also maintain following records / documents related to corrosioncontrol:.CathodicProtectionDesigndocuments.SoilResistivitySurveyReport.ElectricalInterferenceReport.Inspectionandmaintenancereports.Materialcertificationincludingdimension,metallurgy,performanceandfunctionalreport.Materialtestreports.Approveddrawings/documents

dosingshouldbesuchthatitissafeforhumanaswellasmaterialsandequipmentsusedinCGDsystem."]Odourleveltestsshallbecarriedouttorecognisetheodourimpartedbythegassupplier/distributioncompany. These tests are to be carried out at various defined locations on the network and atnetworkextremeends.Ifodourlevelfallsbelowtheminimumacceptablelevelsameshallhavetobe intimated to the control room of the gas supplier and accordingly corrective actions are to betaken.TheodorizingequipmentshallbelocatedinaseparateareaatCGS.Thereshouldbeaclearsafetydistance of 1.5 m around the odorizing and other facilities at the station to facilitate easymaintenanceandpersonnelmovement.The odorant unloading should be done in a safe way. Precautions for handling odorant shall beprominentlydisplayed.Odourant absorber like activated carbon saw dust, dry sand and odorant neutralizer like sodiumhypochloriteforspillagehandlingofodourantshallbeprovided.Provisionshouldbemadeforeyewashoremergencyshowernearodoranthandlingandinjectionsystems,incaseethylmercaptonisusedasodourant.Use of personal protective equipment like face shield, mask, rubber hand gloves, gumboot, safetygogglesetc.forhandlingofodourantspillageshallbeensured.ReferencesASMEB31.8GasTransmissionandDistributionPipingSystems(ASME3ParkAvenue,NewYork,NYUSA10016.www.asme.org).API1104Weldingproceduresandweldersforweldingofgaspipelines.ASME Boiler and Pressure Vessel (BPV) Code Section IX Welding procedures and welders, forstationpiping.ASTM A 395 Valves having shell (body, bonnet, cover and/or end flanges) components made ofcastironand/ductileiron(aspershallnotbeusedinCGDnetworks).BSEN331ValvesusedinservicelinesofsizeNPS2andbelow.ISO8085ElectrofusionfittingsforsizesuptoNPS8.IS5572ElectricalareaclassificationofInstallationforselectionofElectricalEquipmentIS5571,"GuideforselectionofElectricalEquipmentforHazardousArea".IS3043Forearthingofallelectricalequipment,systems,structuresandfencing,etc.IS:2309forLighteningprotectionIS9573SteelbraidedHoseANNEXUREIListofSpecificationsofPipingMaterialsusedinCGDNetworkSteelPipeAPI5LSpecificationforLinepipesASTMA106SeamlessCarbonSteelPipeforHighTemperatureServiceASTMA333SeamlessandWeldedSteelPipeforLowTemperatureServiceGalvanizedGalvanizedIronPipesIS 1239 (Part1) Steel Tubes, Tubular and Other Wrought Steel Fittings Specification Part 1 :SteelTubesValveshttp://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

Reversebendtestsshallbeperformedonthepipepiececutfromthecropend,selectedfromthefront end of the first length and the back end of the last length produced from each coil. Thespecimen shall be 100mm to 115mm long and shall be reverse bend tested in accordance withprocedureandfiguregivenhereinafter.Thereversebendtestshallbecarriedoutwithamandrel.Radius(R)andwidth(A)ofmandrelshallbecalculatedforanycombinationofdiameter,wallthicknessandgradewiththeformula.1.4(Dt)tA=2R=te(D2t)1.4twhere,DOutsidediameterofpipetWallthicknessofpipe1.4PeakingfactoreStrainMinimumvaluesof'e'shallbeasfollows:GradeofSteelMin'e'valueAPI5LGr.B0.1425API5LX420.1375API5LX460.1325API5LX520.1275API5LX600.1225ProcedureThemandrelistobepluggedintothespecimen,withtheweldincontactwithmandrel,tosuchadepth that the angle of engagement between mandrel and specimen reaches 60 (see Figure). Ifthecombinationofdiameterandwallthicknessofpipe,andradiusofmandrelissuchthattheangleofengagementdoesnotreach60,themandrelshallbepluggedintothespecimenuntiloppositewallsofthespecimenmeet.AcceptanceCriteriaAspecimenwhichfracturescompletelypriortothespecifiedengagementofmandrelandspecimen,orwhichrevealscracksandrupturesintheweldorheataffectedzonelongerthan4mm,shallberejected.Crackslessthan6mmlongattheedgesofthespecimenshallnotbecauseforrejection.MicrographicandHardnessExaminationA test specimen shall be taken across the longitudinal weld from one length of finished pipe fromeachlotofmaximum100lengthsfromthesameheatmanufacturedfromthesameprocess.These specimens shall be polished and etched for microexaminations. The examinations shallprovide evidence that heat treatment of weld zone is adequate and there is no untemperedmartensiteleft.

http://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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HardnessmeasurementsoneachspecimenshallbemadeasindicatedinfiguregivenhereinafterinaccordancewithASTME32.Themaximumdifferenceinhardness between base material and any reading taken in the Heat Affected Zone (HAZ) shall belessthan80pointsVicker'sHV10.ANNEXUREIVMinimumRequirementsforGIPipesandCopperTubingusedinservicelinesuptoconsumerapplianceGalvanizedGalvanizedIron(GI)PipesPipesshallbeconformingtoIS:1239(Part1)1990.ThemanufacturershallhaveavalidlicensetouseISIMonogramformanufacturingofpipesinaccordancewiththerequirementsofIS:1239(PartI)1990.NOMINALBORE

15mm

25mm

50mm

80mm

GRADE

MEDIUM('B'CLASS)orHEAVY('C'CLASS)

MEDIUM('B'CLASS)orHEAVY('C'CLASS)

MEDIUM('B'CLASS)orHEAVY('C'CLASS)

MEDIUM('B'CLASS)orHEAVY('C'CLASS)

O.D.mmmax.Min.

21.821.0

34.233.3

60.859.7

89.588.0

THICKNESSmm

2.6forBClassand3.2forCGlass

3.2forBClassand4.0forCGlass

3.6forBclass4.5 4forBclassforCGlassand4.8forCGlass

NOMINALWEIGHTKg/mtr.

1.21forBClassand1.44forCGlass

2.41forBClassand2.93forCGlass

5.03forBclass6.19forCGlass

8.36forBclassand9.90forCGlass

Note:Maximum tolerance on thickness () 10%, Tolerance on weight for single tube 10% and forquantitiesperloadof10tones,7.5%.Pipesshallbedesignedtowithstandatestpressureof5MPa(50bar),maintainedforatleast3secondwithoutshowinganykindofdefects..EddyCurrenttestmaybedoneinplaceofhydrostatictestaspertheproceduregiveninAnnexCofIS:1239(Part1)1990.. All GalvanizedGalvanized Tubes shall be Zinc coated by hot dip galvanizing in accordance with IS:47361986&itsrelevantparts..MinimummassofzinccoatingdeterminedasperIS:67451972shallbe400gms/m2..Thezinccoatingonexternalandinternalsurfacesshallbeadherent,smoothandfreefromhttp://www.pngrb.gov.in/OurRegulation/CGDNetworkGSR612.html

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such imperfections as flux, ash and dross inclusions, bare patches, black spots, pimples,lumpiness,runs,ruststains,bulkywhitedepositsandblisters..RejectionandacceptanceforthesedefectsshallbeasperAppendixAofIS:26291985.Thegalvanizedcoatingwhendeterminedona100mmlongtestpieceinaccordancewithgalvanizedIS:26331986shallwithstand4,oneminutedips..Theadherenceofzinccoatingontubesabove50mmnominalbore,shallbedeterminedbythepivotedhammertestgiveninIS:26291985.Each pipe shall be legibly and durably marked at intervals of not more than one metre with thefollowinginformation(i)Manufacturer'snameortrademark,(ii)ClassofPipeHEAVY,(iii)IndianStandardmarkISI,(iv)BatchNo.ofProduction,ifany.FittingsconformingtotherequirementsofIS1879:1987,IS14329:1995arepermittedtobeusedinTertiarynetwork,operatingatpressures100mbargandbelow:CopperTubingForacopperserviceindomesticnaturalgasinstallations,materialssuppliedshallbeinaccordancewith BS EN 1057:1996. It has replaced the copper tube standard BS 2871 Part 1. BS EN 1057ensuresthequalityofthecopperproductbyspecifyingthepipeintermsofitschemicalcomposition,mechanical properties e.g. tensile strength, hardness, elongation etc., dimension and tolerance,surfacequality,freedomfromdefectsandsuitabilityforpipebending.Copperpipeworkshallbejointedbysolderingorbrazing,usingmechanicalcompressionorcapillarytype fittings. Fittings for use in joining copper tube shall be as per BS EN 1254 Parts 1 and 2.Fittings for capillary soldering and brazing are specified in Part 1 and compression fittings arespecifiedinPart2.Soft soldering utilizes filler metals with melting points at temperatures up to 450C. Filler metalsshallbeasperBSEN29453:1994SoftsoldersalloysChemicalcompositionsandforms.Soldersforusewithcoppertubeandfittingsgenerallymeltwithinthetemperaturerange180Cto250C.CompressionfittingsshallcomplywithBS864Part2orBS2051Part1.Forcapillaryfittings:.Softsoldershallnotbeusedforpressureinexcessof75mbar.Iftheoperatingpressureistoexceed75mbar,then,asolderwithameltingpointofnotlessthan600degreesCshallbeused.Thisshallalsoapplytobrassfittings.Heightlimitforcopperrisers:Althoughthereisnospecificguidanceregardingmaximumheightofcopper risers, IGE/UP/2 only allows the use of steel for risers above heights of 15 meter. Thus,unlesslocalinformationisavailabletothecontrary,15metermaximumheightshallbeconsideredsafeduetoweightandmechanicalstrengthofmaterial.GeneralguidanceinBS6891alsostatesthatcopperpipeworkisnotacceptableinsideaprotectedshaft. Requirements for ventilation and fire stopping shall apply to ducts conveying copper pipework. For an external copper riser system, protection against lightning conductors shall beconsidered.Acoppergaslineshallneverbeusedasagroundforanelectricalsystem.(F.No.Sadmin/11/8/2007VolIRatanP.WatalSecretary,PNGRB3SubstitutedvidePNGRB(TechnicalStandardsandSpecificationsincludingSafetyStandardsfor